Call of Duty: Advanced Warfare zombies mode appears to be DLC

It looks like Call of Duty: Advanced Warfare's zombies mode is downloadable content.

You get Call of Duty: Advanced Warfare's zombies mode as part of the £35 Season Pass, according to a press release sent out by GameStop.

Here's the blurb from GameStop:

"Breaking News for Call of Duty Fans - Zombies are Back!

"This just in, Zombies are back as part of the Call of Duty: Advanced Warfare season pass! Stop by any GameStop to pick up one of the most anticipated games to launch this year, along with 4-multiplayer map packs, Atlas Gorge, and yes - ZOMBIES. All this is available for purchase today GameStop as part of the Call of Duty: Advanced Warfare season pass for only $49.99."

Right now, it appears that zombies mode is unavailable. Is it exclusive to the Season Pass or will it be sold separately? What does it involve? We've asked Activision for more information.

THERE MAY BE SPOILERS AHEAD.

Zombies do make an appearance in the game now, however, albeit in more of a teaser form.

You can unlock a zombies bonus wave in the Exo Survival Co-Op Mode, but to do this you have to unlock every single map, so it takes some doing.